I Receive A Blank Screen When I Upload My Web Application To A Domain
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hi guyz i have a problem that when i upload my site it just only give a blank white page what is the problem for testing purposes i tried a simple web application uploaded but its not working where should i make changes before uploading any idea??

I would do such steps:First of all make sure it's really a server related problem - echo any string right in the beginning of your index.php file and exit script execution. If the string is rendered, make sure to set YII_DEBUG to true and have proper error_reporting level and php.ini display_errors is turned on in your index.php file to see all the errors rendered.
e.g.

now it is giving error 500 i have googled i found that there is a problem in .htaccess file but it is not clear any one have any idea plz help....

In most of times, that means you do not have index file or your index.php has not a correct permission, change your index.php permission to 644 in other hand you should change the permission of all files in your app to 644 and change the permission of all folders to 755

it displayed me the 'hey' but when i replaced that as u said it gave me this error

Warning: require_once(/var/www/vsftpd/m.qau/test/../yii/framework/yii.php): failed to open stream: No such file or directory in /var/www/vsftpd/m.qau/test/index.php on line 13 Fatal error: require_once(): Failed opening required '/var/www/vsftpd/m.qau/test/../yii/framework/yii.php' (include_path='.:/usr/share/php:/usr/share/pear') in /var/www/vsftpd/m.qau/test/index.php on line 13